Validation on field

If I want to add validation on rating_out_of_5 field so that it cannot take value greater than 5.
what should I do?
Is it r8 code?:

frappe.ui.form.on(“Review”, “validate”, function(frm){

if(parseInt(frm.doc.rating_out_of_5) > 5) {
msgprint(__(“Error prompt”));
validated = false;
return;
}

});